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Object and observer motion in the perception of objects by infants.
P J Kellman1, H Gleitman, E S Spelke
1Department of Psychology, Swarthmore College, Pennsylvania 19081.
Journal of Experimental Psychology. Human Perception and Performance
|November 1, 1987
Summary
Sixteen-week-old infants differentiate self-motion from object motion. They use object motion, not self-motion, to perceive unified objects, indicating motion registration is key to object perception.
Area of Science:
- Developmental psychology
- Cognitive science
- Visual perception
Background:
- Infants' ability to perceive object unity from motion is crucial for understanding object permanence.
- Distinguishing self-generated optical flow from object-generated motion is a complex perceptual task.
Purpose of the Study:
- To investigate whether 16-week-old infants differentiate between optical displacements caused by self-motion versus object motion.
- To determine the role of real object motion in infants' perception of partly occluded objects.
Main Methods:
- Infants were exposed to visual displays involving self-motion and object motion.
- Attentional levels were measured to assess infants' responses to different types of optical displacements.
- Perception of partly occluded objects was tested using motion cues.
Main Results:
- Infants distinguished optical displacements from self-motion from those caused by moving objects.
- Attentional responses were higher for real object motion compared to self-motion-induced optical changes.
- Perception of object unity from motion relied on real object motion, not general optical flow.
Conclusions:
- Sixteen-week-old infants can differentiate self-motion from object motion.
- Object perception, including perceiving the unity of partly occluded objects, relies on the registration of real object motion within the 3D layout.